Is it ok to take epitol and dilantin at the same time?

my friend was prescribed both after a major seizure put her in the hospital. She's been on both for a week and can't hardly function because of dizziness and grogginess. Also, maybe not related but she has several large marks on her arm (not from the IV) that we can't figure out, possibly she was banged around when they loaded her in the gurney but not sure.